[wdmaudiodev] Re: Interfacing Audio Driver From USER MODE
- From: Vipin Kumar <vipin@xxxxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sat, 31 Jan 2009 02:36:03 -0800
Hi,
Thanks for your reply, Matt.
i searched the archives but couldn't find any such stuff.Can't you point
me, please?
So, i am basically guessing again
Just returning Status_success and completing the irp( and no passing it
down) will make createfile call successful.
Please let me know some more details about what to do in both IRP_MJ_CREATE
and IRP_MJ_CLOSE to get it working.
Thanks
Regards,Vipin
On Fri, Jan 30, 2009 at 9:49 AM, Matt Gonzalez <matt@xxxxxxxxxxxxx> wrote:
> This has been discussed repeatedly on this list. Please search the
> archives; you need to handle IRP_MJ_CREATE and IRP_MJ_CLOSE.
>
>
> Vipin Kumar wrote:
>
>> Hi,
>> since i am writing an virtual microphone driver, i definitely want it
>> to
>> take data from usermode,( ofcourse via IOCTL).
>> i have written few drivers but never a WDM audio one
>>
>> However when i call createfile, it fails.
>>
>> This is code
>>
>>
>> in the DriverEntry
>> DriverObject->MajorFunction [IRP_MJ_DEVICE_CONTROL] =
>> IoCtlHandler;
>>
>> in ADD device
>>
>> Status = IoRegisterDeviceInterface( PhysicalDeviceObject, &AD_COMM_GUID
>> , NULL , &InstanceString);
>> DbgPrint(" Registered Device Status %d Name Length %d \n" ,
>> Status,InstanceString.Length);
>>
>> if(NT_SUCCESS( ntStatus)){
>> Status = IoSetDeviceInterfaceState(&InstanceString,TRUE); //
>> make it ready for communication
>> DbgPrint(" Ready for Communication Status %d \n" , Status);
>> }
>>
>> All the status are STATUS_SUCCESS.
>>
>> I use SetupDiEnumDeviceInterfaces, SetupDiGetDeviceInterfaceDetail to
>> get
>> my instance
>>
>> i even get it in the Registry in Control\DeviceClasses .
>>
>> My IOCTL handler gives me few IOCTLS while recording.
>>
>> but when i call createfile on it fails
>>
>> Device_Handle = CreateFileW(Device_Name, GENERIC_READ,
>> 0,NULL, OPEN_EXISTING,0,NULL);
>>
>>
>> if(Device_Handle == INVALID_HANDLE_VALUE){
>> printf("Error Occured while Opening Device GetLastError Code
>> %d\n",GetLastError());
>> Error_Code = 1;
>> }
>>
>>
>> i get err code 2 , means file not found, However, i can see the symbolic
>> link using winobj in the Global Directory.
>>
>> So what's WRONG !!!!
>>
>> Sorry for the BIG POST..
>>
>> But can somebody tell what's wrong with my approach.I am just not able to
>> figure it out.Hope somebody from MS will clearify what's required to get
>> it
>> working.
>> It would be better gives a code snippet.
>>
>> Waiting for your help.
>>
>> Thanks.
>>
>> Regards,
>> Vipin
>>
>>
>>
>
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